Eraser holder



June 22 1926.- 1,589,597

J. P. KENNEDY ERASER HOLDER Filed Sept. 28, 1925 Patented June 22, 1926.

rn'raNT ortica.

JOSEPH I. KENNEDY, OF CHICAGO, ILLINOIS.

ERASER HOLDER.

Application filed September My invention relates to a holder forblackeboard erasers and has for its object totprovide a device for thispurpose which will be strong, durable and cheap to manufacture andwhich, while taking a firm grip on the black-board structure, preferablyon the chalk-rail of the blackboard, )reventing accidental displacement,will be capable of-being readily removed therefrom, if need be, forcleaningthe chalk-rail, fory example.

p A further object is to provide a device so constructed as to besightly in appearance.

The invention is illustrated in the accompanyingy drawing, in which Fig.1 is a View in perspective of the eraser holder shown as applied to thechalkrail of a black-board of common construction. i i

Fig. 2 is ac sectional viewon line 2-2 of Fig. 1.

Fig 3' is a vvifew similar to Fig. 2 but showing the eraser receivingmember as it is. about to be attached to the chalk rail, and

Fig. 4 is a View of the retaining member, separately, andas seen fromthe inner side of said member, that is the side which is toward theblack-board when the device is in position on the chalk-rail. f

i Referring tothe drawing, the blackboard structurerisl shown asconsisting of a blackboard 10 having a strip or bead 11 at its lowerledge to which isfastened the chalkrail 12. f

In accordance with my` invention the eraser is held on the chalk rail bymeans of a retaining member 13, composed of sheet metal of someresiliency, preferably, and consisting, in the form ofthe inventionshown `in the drawing, of afront plate 14, end projections land a pairof attaching wings 16,16 which extendback of the front plate,that isbetween the front plate and the forward edge of the challerail,preferablyfromthe end edges ofthe front plate.

" These arrangements might be modified but are deemedparticularlyssuitable for carrying out one of theprinciples of theinvention, namely the provision of an eraser holderl attachable tochalk-rails of `differing cross-sectional configurations.

The wings 16, 16 are formed with-slots 17, preferably tapering, landterminating in circular enlargements 18. i'

A'lheseslotted wings are adaptedl toen gage with attaching `elementsdesigned to be permanently fixed to the forward edge 2s, 1925. serialNo. 59,128.

ence to round headed screws in order to ob-` tain a holding pressure, tothe maximum extent, as between the retaining member and the black-boardstructure, resisting aeci-` i dental displacement of the retainingmemberwhile Permitting it, nevertheless, to be removed when necessary.

This holding pressure may be developed,

through strain of the retaining member, in various ways.

Preferably, the wing 1G is bent toward the front plate 14, that is inthe direction from the bend toward the inner end of the wing, while thewing 16 is given a slight bend outwardly. The retaining member is putover the heads of screws 19, with the heads extending through theenlargements 18 of slots `17, and is then moved to the left (Fig. 3).The wings are thus wedged against the bevels of the screw headsresulting in a frictional grip,-due to the taper of slots 17, astraightening or flattening outof thewings against the edge of thechalkrail, produced by the beveling of the screw n heads and,preferably, also, the development of a pressure between the front plateand the flat outer surfaces of the screw heads. The

strain taking place in the relatively stiff, but 4 slightly resilientretaining member, brings about a bind of the member against thechalk-rail which resists without preventing the detachment of the memberfrom the chalk-rail, which, nevertheless, is readily accomplished by asharp blow on the left hand end of said member. f

It will be understood that this spring grip engagement as between theretaining member and the black-board structure might be accomplished" byexpedients somewhat different from those just described. For example, itis not essential that the screw heads should project far enough from thechalkmail to bear against the front plate,7

although this is desirable in order to increase the holding grip.

It will be observed thatthe screws are completely covered by theretaining member which adds to the appearance of the device i.

and diminishes the likelihood'. that it Will be taken off by someinquisitive child. The strength of the grip is sufficient to deter any*one from attempting tol remove the holder from the black-board withoutknowing' just how such removal is to be accomplished.

One important feature of the device is that it can be applied; to achalk-rail of al*- most any cross-sectional configuration.

Other advantages, which will be apparent, are the low cost ofmanufacture and the ease with which the device may be applied to andremoved from the black-board structure. Realizing the possibility ofmodification within the principles of my invention, I desire t'o coverthe invention in allt embodiments within the scope ofthe appendedclaims.

claim:

l. A black-board eraser holding device comprising in combination withfastening elements permanently fixed to the blackboard structure, asheet metal' retaining member con'iprising a front plate and inturned'.wings adapted to intervene between the front plate and the black boardstructure which are slotted so as to be engageable with saidfasteningelements.

2. A black-board eraser holding device comprising in combination withfastening elements permanently fixed to the blackboard structure, asheet metal retaining` member comprising a front plate and int'nrned`wings, at oppositey ends of said member, adapted to intervene betweenthe front plate and the black board structure which are slotted soas tobe engageable with said fastening elements.l p

3. A black-board eraser holding device comprising in vcombination withfastening elements permanently fixed to the blackboard'A structure, asheet metal retaining member comprising a front plate and inturnedresilient wings adapted to intervene between the front plate and theblack board structure which are slotted for engagement with saidfastening element adapted to bear with spring pressure against theblack-board structure.

at. A black-board eraser holding device comprising in combination withfastening elements permanently fixed to the blacle hoard structure, asheet metal retaining men'iher having inturned wings slotted forengagement with saidl fastening elements and bent slightly so as to beadapted to be ilattened out against the black-board structure when theretaining member is attache-d' thereto to create a holding pressure.

A' black-board eraser holding device comprising in combination withfastenin elements permanently fixed to the blackhoardI structure, asheet metal retaining member having int'urned Wings slotted forengagement with said fastening elements and bent out of parallelism withthe body of said member formed so that a pressure is created between themain portion of the retaining member and the outer surfaces of thefastening elements.

6i A black-board eraser holding device comprising in combination withfastening elements permanently fixed to the blackboard structure, havingundercut beveled heads. an eraser retaining member of spring metalhaving wings extending` between the body of the retaining member and theblackboard structure slotted to engage said fase tening elements andbent out `of parallelism with the body of said member formed so that theretaining member is strained in application to the black-board structureto develop a pressure tending to resist detach? ment therefrom.

7. A black-board eraser holding device for attachment to the chalk-railof a blackboard comprising in combination With fastening elementspermanently fixed to the outer edge ofthe chalk-rail and having undercutbeveled heads, a spring metal eraser retaining member composed of afront plate, end projections extending over the chalkrail toward theblack-board and inturned wings at opposite ends of the front plateslotted to engage said attaching elements.

8. A blacleboard eraser holding device for attachment to the chalk-railof a blackboard comprising in combination with fastening elementspermanently fixed to the outer edge of the chalk-rail and havingundercut beveled heads, a vmetal eraser retaining member composed of afront plate, end projections extending over the chalk-rail toward theblack-board and resilient inturned wings at opposite ends of the frontplate slotted to engage said attaching elements and adapted to bearagainst. the chalkrail with spring pressure.

9. A black-boardy eraser holding device comprising in combination withattaching means permanently fixed to the black-board structure, aI metaleraser-retaining member comprising a plate covering the attachingmeansand resilient portions strained by application to the black-boardstructure so that the device is held in place by spring pressure.

10. A black-board eraser holding device for attachment to the chalk-railof a blackboard comprising in combination with beveled liat headedscrews fixed to' the outer edge: of the chalk-rail, a spring-metaleraser retaining member composed of a front plate, end projectionsextending therefrom toward the black-board and inturned Wings atopposite ends of thefront plate, one of said wings being convergent withthe front plate and the other of said Wings divergent from the frontplate and both provided with beveled slots terminating in enlargementswhereby the Wings may be engaged with said screws.

11. A black-board eraser holding device for attachment to the chalk-railof a blackboard comprising in combination with beveled flat headedscrews fixed to the outer edge of the chalk-rail, a spring-metal eraserretaining member composed of' a front plate, end projections extendingtherefrom toward the black-board and intnrned Wings at opposite ends ofthe front plate, one of said Wings being convergent with the front plateand thel other of said Wings divergent fromy the front plate and bothprovided with beveled slots terminating in enlargements whereby theWings may be engaged with said screws, said screws projecting from theedgeI of the chalk-rail far enough so that with the device in place onthe chalk rail, the front plate of the retaining member bears with somepressure against the outer surfaces of the screw heads.

JOSEPH P. KENNEDY.

